bun.sh/docs/guides/write-file/stream.md

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Write a ReadableStream to a file

To write a ReadableStream to disk, first create a Response instance from the stream. This Response can then be written to disk using Bun.write().

const stream: ReadableStream = ...;
const path = "./file.txt";
const response = new Response(stream);

await Bun.write(path, response);

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See Docs > API > File I/O for complete documentation of Bun.write().